After your game is done you're not even halfway there. Now starts the hard work, promoting your game. It's kind of ignorant to think that uploading an app means a lot of downloads. Here's a few tips.
*Put together a nicely composed e-mail along with press kit containing screenshots, video and link to game.
*Send to magazines, local newspaper, gaming sites, reviwers, editors, youtubers, twitchers etc.
*Be active on social media, engage people.
*Hand out flyers with promo code outside your local supermarket if you have to.
*Attend some games conference or other related gathering to promote your game.
Or hire a PR agency.